Replace the source code in the shader object with code

Property definitions

glesv2 :: glesv2 $ Sys :: glShaderSource
# Replace the source code in the `shader` object with `code`
fun glShaderSource(shader: GLShader, code: CString) `{
	glShaderSource(shader, 1, (GLchar const **)&code, NULL);
`}
lib/glesv2/glesv2.nit:309,1--312,2